--  @testpoint:opengauss关键字user(保留)，作为函数名

--关键字不带引号-失败
drop function if exists user;
create function user(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带双引号-成功
drop function if exists "user";
create function "user"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function "user";

--关键字带单引号-合理报错
drop function if exists 'user';
create function 'user'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `user`;
create function `user`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/